All of these are great, only one that could be bad is the featured auction, as far as costumes go, great, you dont need the costumes. About weapons, as long as these are unique in their looks/gfx or perhaps a gimmick, great, the only possible problem would be if these weapons outclass all other weapons of their type (ie. pure shadow or elemental sword) but I hope they keep in mind they shouldn't be breaking pvp any more than it may be with trinkets and stuff.
A suggestion I'd have is that they release upgrades to the weapon lines that got stuck at lower stars (ie scarlet shield, vitasuit, RSS, etc), these upgrades are wanted. To obtain more money in general they could go and release 500 or whatever number recipes through the featured auctions, and have this the only way to obtain these upgraded weapons. They would earn from the initial bidding war, and later from unbind prices as many of the buyers will start selling the upgraded weapons. Then months later release a batch again, and so on so that everyone is allowed to craft these weapons either by paying or waiting their turn.
;_; Why you gotta get me down like this, bro?
I doubt I can afford the giant scissors from what we've seen of the rare items auction so far, but fingers crossed the knight colour change won't be ludicrous amounts of money. I'm thinking 10k or so. ;o